GMC Canyon Owner's Manual page 213

BAND (AF– Alternate Frequency): Alternate
frequency lets the radio switch to a stronger station
with the same program type. To turn alternate
frequency on, press and hold BAND for
two seconds. AF ON appears on the display.
The radio could switch to stations with a stronger
frequency.
To turn alternate frequency off, press and hold
BAND again for two seconds. AF OFF appears on
the display. The radio does not switch to other
stations.
This function does not apply for XM™ Satellite
Radio Service.
RDS Messages
ALERT!: Alert warns of local or national
emergencies. When an alert announcement comes
on the current radio station, ALERT! appears on
the display. You will hear the announcement, even
if the volume is low or a CD is playing. If a CD is
playing, play stops during the announcement.
Alert announcements cannot be turned off.
ALERT! is not affected by tests of the emergency
broadcast system. This feature is not supported by
all RDS stations.
INFO (Information): If the current station has a
message, the information symbol appears on
the display. Press this button to see the message.
The message may display the artist, song title,
call in phone numbers, etc.
If the entire message is not displayed, parts of
the message appears every three seconds.
To scroll through the message, press and release
the INFO button. A new group of words appears
on the display after every press of this button.
Once the complete message has been displayed,
the information symbol disappears from the
display until another new message is received.
The last message can be displayed by pressing
the INFO button. The last message stays on
the display until a new message is received or the
radio is tuned to a different station.
When a message is not available from a station,
NO INFO appears on the display.
TRAF (Traffic): If TRAF appears on the display,
the tuned station broadcasts traffic announcements.
When a traffic announcement is broadcast on this
station you will hear it.
If the station does not broadcast traffic
announcements, press the TRAF button and
the radio seeks to a station that does.
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